<template>
  <div>
    <!--   面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区-->
    <el-card>
<!--      头部的警告区-->
      <el-alert
        title="注意:只允许为第三级分类设置相关参数!"
        :closable="false" show-icon
        type="warning">
      </el-alert>

<!--      选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
<!--          选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectCateKeys"
            expandTrigger="hover"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>

<!--      tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--        添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many" >
<!--          添加参数的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialog=true">添加参数</el-button>
<!--          动态参数表格-->
          <el-table :data="manyTableData" border stripe>
<!--            展开行-->
            <el-table-column type="expand" label="展开">
              <template slot-scope="scope">
<!--                循环渲染tag标签-->
                <el-tag v-for="(item,index) in scope.row.attr_vals"
                        :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
<!--                输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
<!--                添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
<!--            索引行-->
            <el-table-column type="index" label="#"  align="center"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit"
                           size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete"
                           size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
<!--        添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
<!--          添加属性的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialog=true">添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <!--            展开行-->
            <el-table-column type="expand" label="展开">
              <template slot-scope="scope">
                <!--                循环渲染tag标签-->
                <el-tag v-for="(item,index) in scope.row.attr_vals"
                        :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                <!--                输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--                添加按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--            索引行-->
            <el-table-column type="index" label="#" align="center"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit"
                           size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete"
                           size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
<!--    添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialog"
      width="50%" @close="addDialogClose">
<!--      添加参数的对话框-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialog = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>


    <!--    修改参数的对话框-->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialog"
      width="50%" @close="editDialogClose">
      <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialog = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
       </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  computed:{
    //如果按钮需要被禁用，则返回true否则返回false
    isBtnDisable(){
      if (this.selectCateKeys.length!==3) return true
      return false
    },
    //当前选中的三级分类的id
    cateId(){
      if(this.selectCateKeys.length===3) return this.selectCateKeys[2]
      return null
    },
    //动态计算标题的文本
    titleText(){
      if (this.activeName==='many') return '动态参数'
      else return '静态属性'
    }
  },
  data(){
    return{
      //控制按钮和文本框的切换显示
      inputVisible:false,
      //文本框中输入的内容
      inputValue:'',
      editForm:{
        attr_name:''
      },
      editDialog:false,
      //添加参数的表单数据对象
      addForm:{
        attr_name:''
      },
      //表单数据验证规则
      addFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      addDialog:false,
      //当前激活的页签的名称,
      activeName:'many',

      //级联选择框双向绑定到的数组
      selectCateKeys:[],
    //  商品分类列表
      cateList:[],
      //级联选择框的配置对象
      cateProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      //动态参数的数据
      manyTableData:[],
      //静态参数的数据
      onlyTableData:[],
    }
  },
  created() {
    this.getCateList()
  },
  methods:{
    //将对attr_vals的操作保存到数据库
    saveAttrVals(row){
//  需要发起请求，保存这次操作
      this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(',')
      }).then(({data:res})=>{
        if (res.meta.status!==200) return this.$message.error('修改参数项失败！')
        this.$message.success('修改参数项成功！')
      })
    },
    //删除对应的参数可选项
    handleClose(index,row){
      row.attr_vals.splice(index,1)
      this.saveAttrVals(row)
    },
    //点击按钮展示文本输入框
    showInput(row){
      row.inputVisible=true

      //让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素
      // 被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //文本框失去焦点或按下回车键都会触发
    handleInputConfirm(row){
      if (row.inputValue.trim().length===0){
        row.inputValue=''
        row.inputVisible=false
        return
      }
    //  如果没有return则证明输入的内容需要做后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue=''
      row.inputVisible=false

      this.saveAttrVals(row)
    },
    //根据id删除对应的参数项
    removeParams(attr_id){
      //  弹框提示用户是否删除数据
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(()=>{
        this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`).
        then(({data:res})=>{
          if (res.meta.status!==200) return this.$message.error('删除失败')
          this.$message.success('删除参数成功！')
          this.getParamData()
        })
      }).catch(()=>{
        //用户取消了删除
        return this.$message.info('已取消删除')
      })

    },
    editParams(){
      this.$refs.editFormRef.validate((valid)=>{
        if (!valid) return this.$message.error('提交数据有误，请重写')
        this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName,
          attr_vals:''
        }).then(({data:res})=>{
          if (res.meta.status!==200) return this.$message.error('修改参数失败')
          this.$message.success('修改参数成功！')
          this.editDialog=false
          this.getParamData()
        })
      })
    },
    editDialogClose(){
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮展示修改对话框
    showEditDialog(attr_id){
      //查询当前参数的信息
      this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{
        attr_sel:this.activeName,
        attr_vals:''
        }}).then(({data:res})=>{
        if (res.meta.status!==200) return this.$message.error('查询参数失败')
        this.editForm=res.data
      })
      this.editDialog=true
    },
    //点击按钮添加参数
    addParams(){
      this.$refs.addFormRef.validate((valid)=>{
        if (!valid) return this.$message.error('提交数据有误，请重写')
        this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName,
          attr_vals:''
        }).then(({data:res})=>{
          if (res.meta.status!==201) return this.$message.error('添加参数失败')
          this.$message.success('添加参数成功！')
          this.addDialog=false
          this.getParamData()
        })
      })
    },
    addDialogClose(){
      this.$refs.addFormRef.resetFields()
    },
    //tab页签点击事件的处理函数
    handleTabClick(){
      this.getParamData()
    },
    //级联选择框选中项变化会触发
    handleChange(){
      this.getParamData()
    },
    //获取参数的列表数据
    getParamData(){
      //证明选中的不是三级分类
      if (this.selectCateKeys.length!==3){
        this.selectCateKeys=[]
        this.manyTableData=[]
        this.onlyTableData=[]
        this.$message.error('请选择第三级分类!')
        return
      }
      //  证明选中的是三级数组
      //根据所选分类的Id,和当前所处的面板，获取对应的参数
      this.$http.get(`categories/${this.cateId}/attributes`,{
        params:{sel:this.activeName}
      }).then(({data:res})=>{
        res.data.forEach(item=>{
          //三目运算符判断是否有值，有就分割，没有就空数组，否则''.split(',')=[""]
          item.attr_vals=item.attr_vals?item.attr_vals.split(','):[]
        //  控制文本框的显示和隐藏
          item.inputVisible=false
          //文本框中输入的值
          item.inputValue=''
        })
        if (res.meta.status!==200) return this.$message.error('获取参数列表失败！')
        if (this.activeName==='many') this.manyTableData=res.data
        else this.onlyTableData=res.data
      })

    },
    getCateList(){
      this.$http.get('categories').then(({data:res})=>{
        if (res.meta.status!==200) return this.$message.error('获取商品分类失败')
        this.cateList=res.data
      })
    }
  }
}
</script>

<style scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 0 10px ;
}
.input-new-tag{
 width: 120px;
}
</style>
